body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background-color: #f5f5f5;
    padding-top: 172px;
    padding-bottom: 150px; 
}

header {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 5px;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 170px;
}

nav {
    background-color: #333;
    text-align: center;
}

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
}
nav ul li {
    display: inline-block;
    margin: 10px 80px;
}
nav ul li a {
    color: white;
    text-decoration: none;
}
nav ul li a:hover {
    text-decoration: underline;
}
main {
    padding: 20px;
}
div {
    margin-bottom: 30px;
}
h2 {
    color: #008000;
}
article {
    margin-bottom: 20px;
    border: 1px solid #ddd;
    padding: 10px;
    border-radius: 5px;
    background-color: white;
    height: 300px;
}
article img {
    width: 150px;
    border-radius: 50%;
}
table {
    width: 90%;
    border-collapse: collapse;

}
table th, table td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: center;
}
footer {
    background-color: #4CAF50;
    color: white;
    text-align: center;
    padding: 10px;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
}